When the truck has been driven and is at operating temp. it periodically starts to run rough and then stalls and then will crank but wont restart. By the time its towed and looked at by mechanics its cooled off , starts and runs fine. Local ford dealer and mechanics are scratching their heads. No codes stored in computer. Has anyone experienced this problem? Havnt tried any road side diagnostics yet so dont know whether fuel or spark problem.

Haven't had the problem, and I'm not familiar with the EEC-V. But on the EEC-IV systems there are a number of relays in the wiring that could be malfunctioning. I'd start by looking at the fuel pump relay.